ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Gems, Conchoidal, Brittle
Mg 3(Al,Cr) 2(SiO 4) 3Gemdat.org , Management Team (2012)
Ca 3Ti4+2(Fe3+2Si)O 12Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references